i like to get the neighbors of the Parcels "P1" like following :
From B1 to B2 => P5
B2 => P4
From B2 to B3 => P3
From B3 to B4 => P2
From B4 to B1 => P6
i like to make this process automatic by a GIS software like ArcGIS or Postgis, i have thought to make a buffer of the parcel P1 , to get the lines of the boundary of P1 but i will not get the parcel P4 as neighbor .
any solution to get the neighbors like described above.